They are exceptionally affordable you buy the set of clamping fixtures (head and tail piece) and then attach them to a length of iron black pipe (not included). A nice feature of the BESSEY H series pipe clamp fixtures is their height. The extra high base provides industry leading clearance from the work surface. Clamping fixtures are available to fit 1/2 in. and 3/4 in. black pipe. The Pony 3/4 in. Pipe Clamp is designed to be used on any length of 3/4 in. black pipe. This clamp has a clutch disc design for easy adjustments and can be secured at any point along the bar. This clamp meets the rigorous demands of commercial shops school shops woodworking or metalworking users.